Bar for reinforcing concrete, &amp;c.



F. G. SCHMITZ. BAR FOR REINFOROING CONCRETE, 6w. APPLICATION FILED MAR. 28, 1910.

Patented Sept. 2, 1913.

x Figz i- 1 llllVE/VTOR Frank C. \ycbml'tz.

. New

uniTED STATES PATENT OFFICE.

trans-c. scnn'i'ra, or new: roan, is. r. I

nan non nnmrcnomo concurs, 6m

- Specification of 1mm 1mm.

Patented Sept.2, 1913.

' Application flied Hatch as, mo. Serial no. 561,968.

ing Concrete, &c., of which the following is a specification.

My invention relates to improvements in bars for use in reinforcing concrete and simi lar constructions. Various forms of bars for this purpose have been proposed and a number are in use. It is well recognized a that. to give universal satisfaction under the many conditions of use to which such a bar is subjected that it should in some way be deformed or provided with projections or recesses of some character soas to provent the bar from slipping or working loose in the concrete.

It is my object to produce such a bar at a reasonable cost which will be of uniform strength and holding power from end to end and yet which will not work loose in the concrete.

The accompanying single sheet of drawings illustrates the principles of the invention. For the purpose of reference and to facilitate. the description I will refer to the bar with relation to fixed vertical and horizontal axes transverse to the bar and at right angles to each other. It will be ohvious however that the position of the bar in use is immaterial to this invention.-

'Figure 1, is a vertical projection of a fragment of bar embodying the principle of my invention. Fig. 2, is a transverse section of the same on the plane of the line X-X, Fig. 1. Fig. 3, is a similar view on the plane of the line. Y-Y, Fig. 1. Fig.- 4, is a bottom plan view of the same fragment of a bar. Fig. 5, is a transverse section on the plane of the line Z-Z, Fig. 1. Fig. 6, is an isometric view of a fragment of bar such as is shown in Figs. 1-5 inclusive. Fig. 7, is an isometric view of a modification. Fig. 8, is a similar view of another modification.

Transversely considered the bar is symmetrical about a vertical axis A and a horizontal axis B. The upper and lower surfaces of the bar are zig-zag in outline and the sides of the bar are similar in outline,

' the bar gradually increasing and decreasing in height and also gradually decreasing and increasing in width, the greatest height corresponding to the least width and vice versa. The bar may be said to have a main body portion 1 which is square in cross section and comprised within the cross-hatched areas in Figs. 2, 3 and 5 between the dotted lines. Along the upper and lower parts of the body portions are a series of wedgedshaped pro ections such as 2, 2 and 3, 3 while along the opposite sides of the body portion are the wedged-shaped projections l, 4= and 5, 5. The spaces between the proections along the upper and lower faces of the body portion are equal in longitudinal section tothe longitudinal sectional area of the lateral projections 4 and 5, the he ht of the bar varying inversely to the wi th of the bar as sections are taken progressively from end to end. When considering any transverse section as for instance the section on the plane of the line X-X, of Fig. 1, the height a plus'the width d (Figs. 1 and 4) 1s always equal to the greatest height Proportions of the length and height'or width of the projections from the body. portion of the bar may be varied to suit different conditions of manufacture and use. It may be made by rolling or rerolling, hot or cold, as desired.

In Fig. 7 I have shown a bar in which the points of greatest height are plrolonged longitudinally as at 6 and 6. T ese per tions of the bar in which the cross sectional shape is constant may be made of different lengths as desired greater or less.

In Fig. 8 I have shown a bar in which not only are the upper and lower projections prolonged as at 6 and 6 but the lateral projections are also prolonged as at 7 and 7. Other variations in proportions and design may be effected without departing from the spirit and scope of my invention.

The height of the bar in each case gradually increases from a minimum to a maximum and then gradually decreases to the minimum and so on while the width at correspondin intervals is graduallydecreasing from its maximum to its minimum and vice versa in exact inverse proportions to the changes of height. In each case it will be seen that there are projections along the upper, lower and lateral faces of the bar and the projections on opposite faces are exactly opposite each other and symmetrically ofthe projections. The transverse section I a of the bar and its tensile strength are there- .fore uniform from one end to the other.

ency of the bar to twist or bend when under tension in the concrete. In this bar there is a very high percentage of deformation so as to give a very great holding power in the concrete for a given sectional area and weight of bar. Other advantages than those herein set forth in detail will be appreciated by those familiar with this art. Obviously the bar may be bent or twisted as desired.

What I claim is 1. A reinforcing bar of uniform cross sectional area comprisin a body portion hav ing four series of we ge-shaped projections with intervals between the apices of the pro.- jec-tions of each series, one series being arranged along each of the four sides of the body and the four series having their center lines substantially ninety degrees apart, and g each projection being of uniform width from end to end and being slightly inclined outward from its ends toward its center, the

' width of each projection being substantially greater than its height and the length of each projection being substantially more than twice its height. and the-crowns of the projections on opposite sides being opposite each other and alongside the intervals between the apices of the projections on the intermediate sides.

2. A reinforcing bar comprising a main body port-ion having projections along a plurality of sides forming zig-zag outlines, each projection being the width of the body portion, the projections on opposite sides bemg opposite each other and the projections on the intermediate sides being adjacent the spaces between the first mentioned projections, all of said projections alternately increasing and decreasing" in size gradually, the apex of each projection being in the same transverse plane as the bottom of the spaces between projections on the adjacent sides, the successive projections on each side merging into each other;

There will therefore be no tend-' 3. A reinforcing bar of uniform cross sec tional area com rising a main body ortion havingan angu ar cross section and avmg pro ections arranged along all of the sides thereof, each projection having oppositely in-' clined outer faces of uniform wldth e ual to the width of the body, of the bar an of substantially one-half the length of the projections, the crowns of the projections along opposite sides of the bar being in the same 1 and having wedge shaped projections arranged along the four sides, each project-ion beingthe width of the body of the bar and having flat outer faces slopin from a cen posite;

tral point, the projections along 0 sides being opposite each other and t e projections on the intermediate sides being alongside the spaces between the projections on the'first mentioned sides.

5. A reinforcing bar of the character described having a body of substantially uni form size throughout and provided with a series of projections on each side of the body with intervals between the apices'of the projections, each projection presenting oppositely inclined surfaces or faces. but slightly inclined to the body of the bar and of substantially the same width as the body of the bar and which faces. are longer than the width thereof, the projections on oppo site sides of the bar being arranged in pairs opposite each other and the projections on the intermediate sides of the bar being ar-.

ranged adjacent the intervals between the apices of the other'projections and having their ends overlapping the same substan.

Witnesses:

THOMAS E. OBRI N, NELLIE M. FAILnY.

Copies of this patent may be obtained for five cents each, by addressing the. Commissioner of Eatents. 

